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1 'S QUARTERLY GROUNDWATER MONITORING REPORT FIRST QUARTER—JANUARY 2001 Canepa's Car Wash 248 East Park Street ' Stockton, California ' January 25, 2001 1 INTRODUCTION ' Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on January 2, 200€, at the Canepa's Car Wash facility located at 248 East Park Street in Stockton, California (Figure 1, Appendix A) The groundwater monitoring was conducted at the request of Mr Remo Canepa, facility ' owner, in response to direction froin Mr Ronald Rowe of the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) The work conducted during the quarterly groundwater monitoring was performed in general accordance with approved protocol formerly ' established foi the site The scope-of-work performed was approved by Mr Rowe of the PHS/EHD This report includes site background information, a description of the field and laboratory analyses performed for the January 2001 quarterly monitoring event, discussion of results, and recommendations ' 2 SITE BACKGROUND The site is located in the downtown business district of Stockton, California One 12,000-gallon unleaded I gasoline underground storage tank (UST), one 5,000-gallon leaded gasoline UST, and one 5,000-gallon diesel fuel UST were removed from the site in 1990 According to WHF Environmental Consultants, Inc (WHF), soil samples collected from the UST excavation from approximately 16 feet below the ground surface (bgs) contained elevated concentrations of gasoline and gasoline constituents Between September 1993 and Mai ch 1994, WHF installed six soil borings and seven monitor wells in and around the site Thiee of the monitor wells (MW-1, MW-2, and MW-3) were constructed with a screened ' interval from 45 to 65 feet bgs MW-4 through MW-7 were constructed with a screen interval from 40 to 60 feet bgs ' Beginning in April 1997, Condor implemented a quarterly groundwater monitoring program at the site Following the July 1998 quarterly groundwater monitoring event, Mi Rowe of the PHS/END oideied the installation of additional monitor wells The tops of the screened intervals of monitor wells MW-I ' through MW-7 are submerged below the present groundwater table A work plan dated November 17, 1998, was prepared by Condor for the installation of four additional monitor wells (MW-8 thiough MW- 11) and is cut rently pending approval by the PHS/EHD ' 3 QUARTERLY GROUNDWATER MONITORING —JANUARY 2001 On lanuaiv 2, 2001, Condor representatives made field observations and collected groundwater samples from the seven momtot wells at the site (see Figure 2, Appendix A for well locations) The sampling oidei was as follows MW-7, MW-2, MW-5, MW-4, MW-1, MW-6, and MW-3 I31 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS • The static water level in each well was measured to the nearest 0 01-foot with a battery-operated, flat tape, water-level metes A clean, single-use, polypropylene, disposable bailer was lowered into each well to check foi floating pioduct, petroleum odors, and sheen It should be noted that the groundwater table was above the top of the well screens A moderate petroleum hydrocarbon odor and a slight sheen ItJ CONDOR